if (typeof Promise === "undefined") {
    require("promise/lib/rejection-tracking").enable()
    window.Promise = require("promise/lib/es6-extensions.js")
  }
  
  require("whatwg-fetch")
  
  Object.assign = require("object-assign")
  
  if (process.env.NODE_ENV === "test") {
    require("raf").polyfill(global)
  }
  